Renew a Tourist Visa after 180 days (multiple times) and not get a Temp Resident Visa?

Hello all!
Another newbie question here.

I have been reading all over the internet, here, and TOB about people extending their Tourist Visa after 180 days. Many keep doing this for years.
If am renting for a year and want to make sure I want to stay longer, I might renew my Tourist Visa after 6 months. Then I would get my Temp Resident Visa.

Why do people not get their Temp Resident Visa?

Thanks.

You always have to leave the country to renew a tourist visa even if it is out and right back in. You also have to leave the country and apply for a temp or perm visa at a Mexican consulate. 

None of the above can be done within the country.

To get a temp or perm visa you have to provide financials which many people cannot qualify.

I also read it may be getting harder to keep renewing the Visitor Visa multiple times.

They should only allow a tourist to be in the country for a total of 180 calendar days per year. Similar to the US and Canada.